The Meaning of Product and Revision Codes

The product/revision codes specified on the project options dialog are used by Windows Installer to uniquely identify your installation. If you author two installations that use the same product and revision codes, Windows Installer will treat both as installations of the same product. Therefore, pay attention to the following:

• For different products, always use different product and revision codes. Whenever you generate a new project, InstallAware will automatically generate a new product and revision code for you.
• For different versions of the same product, including product updates, you may use identical product codes, however you must use a different revision code. Having identical product codes but different revision codes between installer packages indicates that one of the packages is an upgrade.